4" DuraVent Appliance Connector 3" x 3" Intakes 46DVA-TCL This appliance connector is used for stoves with 4" X 6-5/8" co-axial outlets. Refer to appliance manufacturer's installation instructions for approval. Uses aluminum flex for both intake and exhaust. Provides combustion air and exhaust venting for gas appliances Clearance to combustibles mandated by appliance listing The components twist-lock together for a quick secure fastener-free installation 0.020" aluminum inner 0.018" steel outer Offsets venting obstructions .020†aluminum inner wall .018†galvanized steel outer wall Painted outer walls made of laser welded .018†galvalume steel. Caps also available in stainless steel and copper. Outer pipe brings combustion air to the appliance. Inner pipe exhausts flue gases to the outside. Gaskets or sealants not required (unless specified by the appliance manufacturer).